\documentclass[dvipdfm]{beamer}
\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{xltxtra}
%\usepackage{identfirst}
\setromanfont{黑体}
\newcommand\Helvetica{\fontspec{Helvetica}}

\begin{document}
\title{三鹿}

\fontspec{LiSu}这是外交隶书\\

\Helvetica
today is the good place

\end{CJK}

\end{document}
